obama told letterman that he recognized that as a mistake. >> virginia's u.s. senate candidate tim kaine and george allen will face-off live. thai get runder way at noon. >> coming up, government helicopter used to pull off the ultimate homecoming proposal. some new information about the teenage girl at the krenter of the scandal. >> a researcher murdered outside of his maryland home. >> we'll >>> we've got an update to a story we shared last night at 11:00. school administrators say they gave the okay for a helicopter homecoming invitation. the father of a student at patriot high school arranged for a border patrol pilot to help his son ask a girl for a date. the pilot dropped the stuffed animal and note on the school's football field last wednesday. the student who got the invitation is a kicker on the football team. victoria tells the washington post this isn't her fers over-the-top invitation. >> a researcher at the national institutes of health has been killed. peter marvin was shot outside his house in baltimore. police initially thought he might have bee